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-rw-r--r--fs/nfsd/nfs4state.c209
-rw-r--r--fs/nfsd/nfs4xdr.c3
-rw-r--r--fs/nfsd/state.h16
3 files changed, 131 insertions, 97 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 8e83cef..3b4ce41 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -113,6 +113,90 @@ nfs4_unlock_state(void)
mutex_unlock(&client_mutex);
}
+static bool is_client_expired(struct nfs4_client *clp)
+{
+ return clp->cl_time == 0;
+}
+
+static __be32 mark_client_expired_locked(struct nfs4_client *clp)
+{
+ if (atomic_read(&clp->cl_refcount))
+ return nfserr_jukebox;
+ clp->cl_time = 0;
+ return nfs_ok;
+}
+
+static __be32 mark_client_expired(struct nfs4_client *clp)
+{
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+ __be32 ret;
+
+ spin_lock(&nn->client_lock);
+ ret = mark_client_expired_locked(clp);
+ spin_unlock(&nn->client_lock);
+ return ret;
+}
+
+static __be32 get_client_locked(struct nfs4_client *clp)
+{
+ if (is_client_expired(clp))
+ return nfserr_expired;
+ atomic_inc(&clp->cl_refcount);
+ return nfs_ok;
+}
+
+/* must be called under the client_lock */
+static inline void
+renew_client_locked(struct nfs4_client *clp)
+{
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ if (is_client_expired(clp)) {
+ WARN_ON(1);
+ printk("%s: client (clientid %08x/%08x) already expired\n",
+ __func__,
+ clp->cl_clientid.cl_boot,
+ clp->cl_clientid.cl_id);
+ return;
+ }
+
+ dprintk("renewing client (clientid %08x/%08x)\n",
+ clp->cl_clientid.cl_boot,
+ clp->cl_clientid.cl_id);
+ list_move_tail(&clp->cl_lru, &nn->client_lru);
+ clp->cl_time = get_seconds();
+}
+
+static inline void
+renew_client(struct nfs4_client *clp)
+{
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ spin_lock(&nn->client_lock);
+ renew_client_locked(clp);
+ spin_unlock(&nn->client_lock);
+}
+
+void put_client_renew_locked(struct nfs4_client *clp)
+{
+ if (!atomic_dec_and_test(&clp->cl_refcount))
+ return;
+ if (!is_client_expired(clp))
+ renew_client_locked(clp);
+}
+
+void put_client_renew(struct nfs4_client *clp)
+{
+ struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
+
+ if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
+ return;
+ if (!is_client_expired(clp))
+ renew_client_locked(clp);
+ spin_unlock(&nn->client_lock);
+}
+
+
static inline u32
opaque_hashval(const void *ptr, int nbytes)
{
@@ -864,7 +948,7 @@ static void free_session(struct kref *kref)
__free_session(ses);
}
-static void nfsd4_put_session(struct nfsd4_session *ses)
+void nfsd4_put_session(struct nfsd4_session *ses)
{
struct nfsd_net *nn = net_generic(ses->se_client->net, nfsd_net_id);
@@ -968,38 +1052,6 @@ unhash_session(struct nfsd4_session *ses)
spin_unlock(&ses->se_client->cl_lock);
}
-/* must be called under the client_lock */
-static inline void
-renew_client_locked(struct nfs4_client *clp)
-{
- struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
-
- if (is_client_expired(clp)) {
- WARN_ON(1);
- printk("%s: client (clientid %08x/%08x) already expired\n",
- __func__,
- clp->cl_clientid.cl_boot,
- clp->cl_clientid.cl_id);
- return;
- }
-
- dprintk("renewing client (clientid %08x/%08x)\n",
- clp->cl_clientid.cl_boot,
- clp->cl_clientid.cl_id);
- list_move_tail(&clp->cl_lru, &nn->client_lru);
- clp->cl_time = get_seconds();
-}
-
-static inline void
-renew_client(struct nfs4_client *clp)
-{
- struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
-
- spin_lock(&nn->client_lock);
- renew_client_locked(clp);
- spin_unlock(&nn->client_lock);
-}
-
/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
static int
STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
@@ -1051,33 +1103,12 @@ free_client(struct nfs4_client *clp)
kfree(clp);
}
-void
-release_session_client(struct nfsd4_session *session)
-{
- struct nfs4_client *clp = session->se_client;
- struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
-
- nfsd4_put_session(session);
- if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
- return;
- /*
- * At this point we also know all sessions have refcnt 1,
- * so free_client will delete them all if necessary:
- */
- if (is_client_expired(clp))
- free_client(clp);
- else
- renew_client_locked(clp);
- spin_unlock(&nn->client_lock);
-}
-
/* must be called under the client_lock */
static inline void
unhash_client_locked(struct nfs4_client *clp)
{
struct nfsd4_session *ses;
- mark_client_expired(clp);
list_del(&clp->cl_lru);
spin_lock(&clp->cl_lock);
list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
@@ -1119,8 +1150,8 @@ destroy_client(struct nfs4_client *clp)
rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
spin_lock(&nn->client_lock);
unhash_client_locked(clp);
- if (atomic_read(&clp->cl_refcount) == 0)
- free_client(clp);
+ WARN_ON_ONCE(atomic_read(&clp->cl_refcount));
+ free_client(clp);
spin_unlock(&nn->client_lock);
}
@@ -1815,8 +1846,12 @@ nfsd4_create_session(struct svc_rqst *rqstp,
goto out_free_conn;
}
old = find_confirmed_client_by_name(&unconf->cl_name, nn);
- if (old)
+ if (old) {
+ status = mark_client_expired(old);
+ if (status)
+ goto out_free_conn;
expire_client(old);
+ }
move_to_confirmed(unconf);
conf = unconf;
} else {
@@ -2014,6 +2049,7 @@ nfsd4_sequence(struct svc_rqst *rqstp,
{
struct nfsd4_compoundres *resp = rqstp->rq_resp;
struct nfsd4_session *session;
+ struct nfs4_client *clp;
struct nfsd4_slot *slot;
struct nfsd4_conn *conn;
__be32 status;
@@ -2034,19 +2070,23 @@ nfsd4_sequence(struct svc_rqst *rqstp,
status = nfserr_badsession;
session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
if (!session)
- goto out;
+ goto out_no_session;
+ clp = session->se_client;
+ status = get_client_locked(clp);
+ if (status)
+ goto out_no_session;
status = nfserr_too_many_ops;
if (nfsd4_session_too_many_ops(rqstp, session))
- goto out;
+ goto out_put_client;
status = nfserr_req_too_big;
if (nfsd4_request_too_big(rqstp, session))
- goto out;
+ goto out_put_client;
status = nfserr_badslot;
if (seq->slotid >= session->se_fchannel.maxreqs)
- goto out;
+ goto out_put_client;
slot = session->se_slots[seq->slotid];
dprintk("%s: slotid %d\n", __func__, seq->slotid);
@@ -2061,7 +2101,7 @@ nfsd4_sequence(struct svc_rqst *rqstp,
if (status == nfserr_replay_cache) {
status = nfserr_seq_misordered;
if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
- goto out;
+ goto out_put_client;
cstate->slot = slot;
cstate->session = session;
/* Return the cached reply status and set cstate->status
@@ -2071,7 +2111,7 @@ nfsd4_sequence(struct svc_rqst *rqstp,
goto out;
}
if (status)
- goto out;
+ goto out_put_client;
nfsd4_sequence_check_conn(conn, session);
conn = NULL;
@@ -2088,26 +2128,24 @@ nfsd4_sequence(struct svc_rqst *rqstp,
cstate->session = session;
out:
- /* Hold a session reference until done processing the compound. */
- if (cstate->session) {
- struct nfs4_client *clp = session->se_client;
-
- nfsd4_get_session(cstate->session);
- atomic_inc(&clp->cl_refcount);
- switch (clp->cl_cb_state) {
- case NFSD4_CB_DOWN:
- seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
- break;
- case NFSD4_CB_FAULT:
- seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
- break;
- default:
- seq->status_flags = 0;
- }
+ nfsd4_get_session(cstate->session);
+ switch (clp->cl_cb_state) {
+ case NFSD4_CB_DOWN:
+ seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
+ break;
+ case NFSD4_CB_FAULT:
+ seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
+ break;
+ default:
+ seq->status_flags = 0;
}
+out_no_session:
kfree(conn);
spin_unlock(&nn->client_lock);
return status;
+out_put_client:
+ put_client_renew_locked(clp);
+ goto out_no_session;
}
__be32
@@ -2276,8 +2314,12 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
expire_client(unconf);
} else { /* case 3: normal case; new or rebooted client */
conf = find_confirmed_client_by_name(&unconf->cl_name, nn);
- if (conf)
+ if (conf) {
+ status = mark_client_expired(conf);
+ if (status)
+ goto out;
expire_client(conf);
+ }
move_to_confirmed(unconf);
nfsd4_probe_callback(unconf);
}
@@ -3189,13 +3231,12 @@ nfs4_laundromat(struct nfsd_net *nn)
clientid_val = t;
break;
}
- if (atomic_read(&clp->cl_refcount)) {
+ if (mark_client_expired_locked(clp)) {
dprintk("NFSD: client in use (clientid %08x)\n",
clp->cl_clientid.cl_id);
continue;
}
- unhash_client_locked(clp);
- list_add(&clp->cl_lru, &reaplist);
+ list_move(&clp->cl_lru, &reaplist);
}
spin_unlock(&nn->client_lock);
list_for_each_safe(pos, next, &reaplist) {
@@ -4581,6 +4622,8 @@ nfs4_check_open_reclaim(clientid_t *clid, bool sessions, struct nfsd_net *nn)
u64 nfsd_forget_client(struct nfs4_client *clp, u64 max)
{
+ if (mark_client_expired(clp))
+ return 0;
expire_client(clp);
return 1;
}
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 9b02b66..700de01 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3684,7 +3684,8 @@ nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compo
cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
}
/* Renew the clientid on success and on replay */
- release_session_client(cs->session);
+ put_client_renew(cs->session->se_client);
+ nfsd4_put_session(cs->session);
}
return 1;
}
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 327552b..07f8a82 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -209,6 +209,8 @@ struct nfsd4_session {
struct nfsd4_slot *se_slots[]; /* forward channel slots */
};
+extern void nfsd4_put_session(struct nfsd4_session *ses);
+
/* formatted contents of nfs4_sessionid */
struct nfsd4_sessionid {
clientid_t clientid;
@@ -284,18 +286,6 @@ struct nfs4_client {
struct net *net;
};
-static inline void
-mark_client_expired(struct nfs4_client *clp)
-{
- clp->cl_time = 0;
-}
-
-static inline bool
-is_client_expired(struct nfs4_client *clp)
-{
- return clp->cl_time == 0;
-}
-
/* struct nfs4_client_reset
* one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
* upon lease reset, or from upcall to state_daemon (to read in state
@@ -484,7 +474,7 @@ extern void nfs4_put_delegation(struct nfs4_delegation *dp);
extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(const char *name,
struct nfsd_net *nn);
extern bool nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn);
-extern void release_session_client(struct nfsd4_session *);
+extern void put_client_renew(struct nfs4_client *clp);
extern void nfsd4_purge_closed_stateid(struct nfs4_stateowner *);
/* nfs4recover operations */
generated by cgit v1.1 at 2024-12-25 05:31:22 +0000